A vibrational alarm device for use in combination with an alarm clock, includes a receiver for receiving a RF alarm signal transmitted by the alarm clock, an operating circuit for providing an operating signal in response to the receiver receiving the alarm signal, and an electro-mechanical vibrator for vibration in response to the operating signal provided by the operating circuit. The present invention relates to a golf ball comprising at least one layer of a core and a cover formed on the core, wherein the cover is formed from a cover resin composition mainly comprising a mixture of polyurethane-based thermoplastic elastomer, and a functional group modified polyester-based thermoplastic elastomer as a base resin. The individual radially expandable cylindrical elements consist of ribbon-like material disposed in an undulating pattern. If the rich content does exceed the threshold amount, the rich content is encoded into a plurality of content blocks.